How can a woman combine caring for her young children with her need for devotion in prayer, especially when there is a child who is jealous and harms his brother, and another who needs continuous care during prayer?

It is permissible to place a small child in a high place where an older child cannot reach him and pray next to him, or to occupy the older child with toys. There is no harm in a little movement during prayer, such as quieting a child, but excessive movement invalidates the prayer.